/**********************************************************************************

    Up Scope

    Driver by Mariusz Wojcieszek

***********************************************************************************

    Up Scope
    Grand Products 1986

    rom board       +--------------+
                                      amiga I/O board
    u4  u3  u2  u1
            u6  u5      Amiga 500      7404 7400
                                       74374 6116  8255  TIP120 TIP120
    u12 u11 u10 u9                         battery       TIP120 TIP120 TIP120 TIP120
            u14 u13                                      TIP120 TIP120 TIP120 TIP120



                    +---------------+

**********************************************************************************/

#include "driver.h"
#include "vidhrdw/generic.h"
#include "includes/amiga.h"



/*************************************
 *
 *  Debugging
 *
 *************************************/

#define LOG_IO			0



/*************************************
 *
 *  Globals
 *
 *************************************/

static UINT8 prev_cia1_porta;
static UINT8 parallel_data;
static UINT8 nvram_address_latch;
static UINT8 nvram_data_latch;



/*************************************
 *
 *  Reset state
 *
 *************************************/

static void upscope_reset(void)
{
	prev_cia1_porta = 0xff;
}



/*************************************
 *
 *  CIA-A port A access:
 *
 *  PA7 = game port 1, pin 6 (fire)
 *  PA6 = game port 0, pin 6 (fire)
 *  PA5 = /RDY (disk ready)
 *  PA4 = /TK0 (disk track 00)
 *  PA3 = /WPRO (disk write protect)
 *  PA2 = /CHNG (disk change)
 *  PA1 = /LED (LED, 0=bright / audio filter control)
 *  PA0 = OVL (ROM/RAM overlay bit)
 *
 *************************************/

static void upscope_cia_0_porta_w(UINT8 data)
{
	/* switch banks as appropriate */
	memory_set_bank(1, data & 1);

	/* swap the write handlers between ROM and bank 1 based on the bit */
	if ((data & 1) == 0)
		/* overlay disabled, map RAM on 0x000000 */
		memory_install_write16_handler(0, ADDRESS_SPACE_PROGRAM, 0x000000, 0x07ffff, 0, 0, MWA16_BANK1);

	else
		/* overlay enabled, map Amiga system ROM on 0x000000 */
		memory_install_write16_handler(0, ADDRESS_SPACE_PROGRAM, 0x000000, 0x07ffff, 0, 0, MWA16_ROM);
}



/*************************************
 *
 *  CIA-A port B access:
 *
 *  PB7 = parallel data 7
 *  PB6 = parallel data 6
 *  PB5 = parallel data 5
 *  PB4 = parallel data 4
 *  PB3 = parallel data 3
 *  PB2 = parallel data 2
 *  PB1 = parallel data 1
 *  PB0 = parallel data 0
 *
 *************************************/

static void upscope_cia_0_portb_w(UINT8 data)
{
	parallel_data = data;
}

static UINT8 upscope_cia_0_portb_r(void)
{
	return nvram_data_latch;
}



/*************************************
 *
 *  CIA-B port A access:
 *
 *  PA7 = com line /DTR
 *  PA6 = com line /RTS
 *  PA5 = com line /carrier detect
 *  PA4 = com line /CTS
 *  PA3 = com line /DSR
 *  PA2 = SEL (Centronics parellel control)
 *  PA1 = POUT (Centronics parellel control)
 *  PA0 = BUSY (Centronics parellel control)
 *
 *************************************/

static UINT8 upscope_cia_1_porta_r(void)
{
	return 0xf8 | (prev_cia1_porta & 0x07);
}

static void upscope_cia_1_porta_w(UINT8 data)
{
	/* on a low transition of POUT, we latch stuff for the NVRAM */
	if ((prev_cia1_porta & 2) && !(data & 2))
	{
		/* if SEL == 1 && BUSY == 0, we latch an address */
		if ((data & 5) == 4)
		{
			if (LOG_IO) logerror("Latch address: %02X\n", parallel_data);
			nvram_address_latch = parallel_data;
		}

		/* if SEL == 1 && BUSY == 1, we write data to internal registers */
		else if ((data & 5) == 5)
		{
			switch (nvram_address_latch)
			{
				case 0x01:
					/* lamps:
                        01 = Enemy Right
                        02 = Enemy Left
                        04 = Torpedo 1
                        08 = Torpedo 2
                        10 = Torpedo 3
                        20 = Torpedo 4
                        40 = Sight
                        80 = Bubble Light
                    */
					break;

				case 0x02:
					/* coin counter */
					coin_counter_w(0, data & 1);
					break;

				case 0x03:
					/* Written $98 at startup and nothing afterwards */
					break;

				default:
					logerror("Internal register (%d) = %02X\n", nvram_address_latch, parallel_data);
					break;
			}
		}

		/* if SEL == 0 && BUSY == 1, we write data to NVRAM */
		else if ((data & 5) == 1)
		{
			if (LOG_IO) logerror("NVRAM data write @ %02X = %02X\n", nvram_address_latch, parallel_data);
			generic_nvram[nvram_address_latch] = parallel_data;
		}

		/* if SEL == 0 && BUSY == 0, who knows? */
		else
		{
			logerror("Unexpected: POUT low with SEL == 0/BUSY == 0\n");
		}
	}

	/* on a low transition of BUSY, we latch stuff for reading */
	else if ((prev_cia1_porta & 1) && !(data & 1))
	{
		/* if SEL == 1, we read internal data registers */
		if (data & 4)
		{
			if (LOG_IO) logerror("Internal register (%d) read\n", nvram_address_latch);
			nvram_data_latch = (nvram_address_latch == 0) ? readinputportbytag("IO0") : 0xff;
		}

		/* if SEL == 0, we read NVRAM */
		else
		{
			nvram_data_latch = generic_nvram[nvram_address_latch];
			if (LOG_IO) logerror("NVRAM data read @ %02X = %02X\n", nvram_address_latch, nvram_data_latch);
		}
	}

	/* remember the previous value */
	prev_cia1_porta = data;
}



/*************************************
 *
 *  Memory map
 *
 *************************************/

static ADDRESS_MAP_START( main_map, ADDRESS_SPACE_PROGRAM, 16 )
	ADDRESS_MAP_FLAGS( AMEF_UNMAP(1) )
	AM_RANGE(0x000000, 0x07ffff) AM_RAMBANK(1) AM_BASE(&amiga_chip_ram)	AM_SIZE(&amiga_chip_ram_size)
	AM_RANGE(0xbfd000, 0xbfefff) AM_READWRITE(amiga_cia_r, amiga_cia_w)
	AM_RANGE(0xc00000, 0xdfffff) AM_READWRITE(amiga_custom_r, amiga_custom_w) AM_BASE(&amiga_custom_regs)
	AM_RANGE(0xe80000, 0xe8ffff) AM_READWRITE(amiga_autoconfig_r, amiga_autoconfig_w)
	AM_RANGE(0xfc0000, 0xffffff) AM_ROM AM_REGION(REGION_USER1, 0)			/* System ROM */

	AM_RANGE(0xf00000, 0xf7ffff) AM_ROM AM_REGION(REGION_USER2, 0)
ADDRESS_MAP_END



/*************************************
 *
 *  Input ports
 *
 *************************************/

INPUT_PORTS_START( upscope )
	PORT_START_TAG("POT1DAT")
	PORT_BIT( 0xff, 0x80, IPT_PADDLE) PORT_SENSITIVITY(25) PORT_MINMAX(0x02,0xfe) PORT_KEYDELTA(5) PORT_CENTERDELTA(0) PORT_REVERSE

	PORT_START_TAG("IO0")
	PORT_SERVICE( 0x01, IP_ACTIVE_LOW )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_BUTTON1 )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_COIN1 )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_COIN2 )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_JOYSTICK_UP )
INPUT_PORTS_END



/*************************************
 *
 *  Sound definitions
 *
 *************************************/

static struct CustomSound_interface amiga_custom_interface =
{
	amiga_sh_start
};



/*************************************
 *
 *  Machine driver
 *
 *************************************/

static MACHINE_DRIVER_START( upscope )

	/* basic machine hardware */
	MDRV_CPU_ADD(M68000, 7159090)        /* 7.15909 Mhz (NTSC) */
	MDRV_CPU_PROGRAM_MAP(main_map,0)
	MDRV_CPU_VBLANK_INT(amiga_scanline_callback, 262)

	MDRV_FRAMES_PER_SECOND(59.997)
	MDRV_VBLANK_DURATION(0)

	MDRV_MACHINE_RESET(amiga)
	MDRV_NVRAM_HANDLER(generic_0fill)

    /* video hardware */
	MDRV_VIDEO_ATTRIBUTES(VIDEO_TYPE_RASTER | VIDEO_UPDATE_BEFORE_VBLANK)
	MDRV_SCREEN_SIZE(512*2, 262)
	MDRV_VISIBLE_AREA((129-8)*2, (449+8-1)*2, 44-8, 244+8-1)
	MDRV_PALETTE_LENGTH(4096)
	MDRV_PALETTE_INIT(amiga)

	MDRV_VIDEO_START(amiga)
	MDRV_VIDEO_UPDATE(generic_bitmapped)

	/* sound hardware */
	MDRV_SPEAKER_STANDARD_STEREO("left", "right")

	MDRV_SOUND_ADD(CUSTOM, 3579545)
	MDRV_SOUND_CONFIG(amiga_custom_interface)
	MDRV_SOUND_ROUTE(0, "right", 0.50)
	MDRV_SOUND_ROUTE(1, "left", 0.50)
	MDRV_SOUND_ROUTE(2, "left", 0.50)
	MDRV_SOUND_ROUTE(3, "right", 0.50)
MACHINE_DRIVER_END



/*************************************
 *
 *  ROM definitions
 *
 *************************************/

ROM_START( upscope )
	ROM_REGION(0x80000, REGION_USER1, 0)
	ROM_LOAD16_WORD_SWAP( "kick12.rom", 0x000000, 0x40000, CRC(a6ce1636) SHA1(11f9e62cf299f72184835b7b2a70a16333fc0d88) )
	ROM_COPY( REGION_USER1, 0x000000, 0x040000, 0x040000 )

	ROM_REGION(0x080000, REGION_USER2, 0)
	ROM_LOAD16_BYTE( "upscope.u5",   0x000000, 0x008000, CRC(c109912e) SHA1(dcac9522e3c4818b2a02212b9173540fcf4bd463) )
	ROM_LOAD16_BYTE( "upscope.u13",  0x000001, 0x008000, CRC(9c8b071a) SHA1(69f9f8c17630ed568975e65dadc03213677a12dd) )
	ROM_LOAD16_BYTE( "upscope.u6",   0x010000, 0x008000, CRC(962f371e) SHA1(5682c62f34df2cc70f6125cf14203087670571db) )
	ROM_LOAD16_BYTE( "upscope.u14",  0x010001, 0x008000, CRC(1231bfc1) SHA1(f99adfabb01c1a15130f82f6a09d5458109a28bb) )

	ROM_LOAD16_BYTE( "upscope.u1",   0x040000, 0x008000, CRC(7a8de1fb) SHA1(30b87f07e0e0f66699402dffaeb0ca00c554f23e) )
	ROM_LOAD16_BYTE( "upscope.u9",   0x040001, 0x008000, CRC(5d16521e) SHA1(93e0a1644bd8adbb6f9fca6d4a252c11812c6ada) )
	ROM_LOAD16_BYTE( "upscope.u2",   0x050000, 0x008000, CRC(2089ef6b) SHA1(a12d87c8b368ffbadb556aca2e43e50348d34839) )
	ROM_LOAD16_BYTE( "upscope.u10",  0x050001, 0x008000, CRC(fbab44f5) SHA1(cd49f1f79e2181b3a9c40aebfba9d7c314dc909b) )

	ROM_LOAD16_BYTE( "upscope.u3",   0x060000, 0x008000, CRC(9b325528) SHA1(5bde1a42b62dd810843349ee9edf76e1c7521653) )
	ROM_LOAD16_BYTE( "upscope.u11",  0x060001, 0x008000, CRC(40e54449) SHA1(7d6ed97b87d74d80776cb682c78cd3b4a68633f4) )
	ROM_LOAD16_BYTE( "upscope.u4",   0x070000, 0x008000, CRC(6585ef1d) SHA1(b95e5e424266a50d4b63501278eb5d618fde5ba2) )
	ROM_LOAD16_BYTE( "upscope.u12",  0x070001, 0x008000, CRC(a909e388) SHA1(62acc30ab97d6a46a6d0782bb4ceb58061332724) )
ROM_END



/*************************************
 *
 *  Driver init
 *
 *************************************/

DRIVER_INIT( upscope )
{
	static const amiga_machine_interface upscope_intf =
	{
		ANGUS_CHIP_RAM_MASK,
		NULL, upscope_cia_0_portb_r,
		upscope_cia_0_porta_w, upscope_cia_0_portb_w,
		upscope_cia_1_porta_r, NULL,
		upscope_cia_1_porta_w, NULL,
		NULL, NULL,
		NULL, NULL,
		NULL, upscope_reset
	};
	amiga_machine_config(&upscope_intf);

	/* allocate NVRAM */
	generic_nvram_size = 0x100;
	generic_nvram = auto_malloc(generic_nvram_size);

	/* set up memory */
	memory_configure_bank(1, 0, 1, amiga_chip_ram, 0);
	memory_configure_bank(1, 1, 1, memory_region(REGION_USER1), 0);
}



/*************************************
 *
 *  Game drivers
 *
 *************************************/

GAME( 1986, upscope, 0, upscope, upscope, upscope, ORIENTATION_FLIP_X, "Grand Products", "Up Scope", GAME_IMPERFECT_SOUND )
